Method of making knife heads



Sept. 29, 1925. 1,555,084

I M.$KLOVSKY METHOD OF MAKING KNIFE HEADS.

Filed April 5, l922 Tray-11%,

71 544255 LW/QMW Patented Sept. 29, 1925 UNITED STATES PATENT OFFICE.

MAX SKLOVSKY, OF MOLINE, ILLINOIS, ASSIGNOR T0 DEERE & COMPANY, OF MOLINE,

ILLINOIS, A CORPORATION OF ILLINOIS.

METHOD OF MAKING KNIFE HEADS.

Application filed April 3,

To all whom it may concern: 7 Be it known that I, MAX SKLOVSKY, a citizen of the United States, residing at Moline, in the county of Rock Island and State of Illinois, have invented certain new and useful Improvements in Methods of Making Knife Heads, of which the following is a specification, reference being had therein to the accompanying drawing.

My invention relates to the cutting mechanism of mowing machines and more particularly to the knife head, and the object of my invention is to provide a device of this class made of steel and forged to the shape desired, producing a simple and economical structure.

Referring to the drawings in which simi lar numerals indicate identical parts 2- Figure 1 is a plan view showing the first step in the manufacture of my device.

Figure 2 is a rear elevation of Figure 1.

Figure 3 is a section, on the line 3-3 of Figure 2, illustrating the formation for receiving the spherical bearing member.

Figure i is similar to Figure 3 but show ing the spherical member in position to be secured in place.

Figure 5 is a section on the same lines as Figure 3 but showing the spherical member rigidly secured on the knife head.

Figure 6 is a view of the spherical member, and Figure 7 is a plan View of a finished knife head.

The knife head blank, as shown in Figure 1, is forged with an extended part or shank 1, the laterally projected flanges 2 and 3 and a vertical web 4 which is extended vertically at a, between the flanges 2 and 3, with semi-circular outline, and is provided with an opening 5. Holes 6 are punched for the reception of rivets by which the knife head is secured to the cutter bar. By the employment of suitable dies the part a of the web 4 is upset transversely of the web 4 and 1922. Serial No. 549,351.

preferably rearward, and at the same time the opening 5 is enlarged, as shown in F igure 3, for reception of a spherical member 7.

The spherical member 7 is made with a circumferential groove 8 having a width of the thickness of the part a of the web 4. The spherical member 7 is inserted in the opening 5 until the rim of the latter registers with the groove 8 in the member 7; at this point in the process of manufacture the part a is subjected to pressure restoring the upset portion to its original flattened condition and contracting the opening 5, whereby the web is forced into the groove 8 holding the spherical member rigidly in place in the opening 5 and presenting a semi-pherical bearing surface on each side of the web 4;, as illustrated in Figures 5 and 7.

VVh-at I claim is- 1. The process of forming a knife head with laterally extending flanges and a vertical web with a circular opening, and expanding said opening to receive a spherical member and contracting said opening to rigidly hold said member.

The process of forming a knife head with laterally extending flanges and a vertical web with a circular opening, and expanding said opening to receive a spherical member having a circumferential groove, and contracting said opening to force the Web in said groove and rigidly hold said member.

3. The process of forming a knife head with laterally extending flanges and a vertical web with a'circular opening, and upsetting said web transversely to expand the opening to receive a circumferential the upset portion transversely of said web and contracting said opening to force the web into said groove and rigidly hold the member.

MAX SKLOVSKY.

a circular member having 

